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  • CI/SfB Xt6

    May 2010

    CONCRETE

    HALFEN KWIKASTRIP

    CONCRETE

    HALFEN KWIKASTRIP KT 10-EE

    424.87 Kwikastrip_4:424.68 HDB Studrail 6/5/10 09:40 Page 9

  • 2Halfen Kwikastrip reinforcement continuity strip

    Halfen

    Halfen Limited is a leading supplierof building fixings andcomponents, with manufacturingand marketing centres worldwide.

    For over 75 years Halfen hasmaintained a position at theforefront of the construction fixingsmarket, establishing a reputationfor technological innovation,product reliability and customerservice.

    Introduction

    The concept of reinforcementcontinuity strip has been inwidespread use throughout Europefor over 20 years and repeatedlydemonstrates itself to be a simple,time saving and cost effectivemethod of maintaining reinforcementcontinuity across construction jointsin concrete.

    The system comprises specialpre-bent reinforcement housed ina purpose designed carrier casing all of which is fabricated off site ina factory controlled environment.

    On site, the entire unit is cast intothe face of the wall. Afterthe formwork is struck, the lid isremoved to reveal the connectionlegs (or starter bars) laying insidethe casing. These legs are bent outby the contractor, ready for lappingthe main reinforcement of thesubsequent pour.

    The casing remains embedded inthe wall, providing a rebate intowhich the concrete of the adjoiningmember is poured and eliminatesthe need for traditional preparation(i.e. scabbling) at the joint.

    Technical support including:

    Application advice

    Design guidance

    Software training

    Proposal drawings

    Working drawings

    Site visits

    Estimating support including:

    Budget quotations

    Priced alternatives

    Product schedules

    QA System including:

    BS EN ISO 9001: 2000

    Certificate of Conformity

    Design Warranty

    Halfen reinforcement helpline: 01582 470300 www.halfen.co.uk

    424.87 Kwikastrip_4:424.68 HDB Studrail 6/5/10 09:39 Page 2

  • 3Halfen reinforcement helpline: 01582 470300 www.halfen.co.uk

    Benefits

    Simplifies formwork design bypasses construction joints

    Accelerates pour schedules suitstodays fast track build methods

    Easy to use an answer to skillsshortages of chippies and steelfixers

    No formwork damage or wastage no drilled holes in shutters/nowasted stop ends

    Enables system formwork to beused e.g. steel forms/climbingand slip forms

    Starter bars remain protected andclean they are inside the casinguntil needed

    No projecting bars better workingaccess in confined areas andimproved site safety

    Improved shear connection provides additional formedjoint rebate

    Application

    Quite simply, any construction jointin concrete has the potential to beformed by this method. Normalapplications include:

    Walls Floor slabs Staircase landings and flights Brick support nibs Corbels Pile caps Underpinning Gulleys and chambers

    424.87 Kwikastrip_4:424.68 HDB Studrail 6/5/10 09:39 Page 3

  • 4 Halfen reinforcement helpline: 01582 470300 www.halfen.co.uk

    The Kwikastrip unit is either nailed(through casing) to the shutter face,or the projecting anchoragereinforcement is securely wired backto the main reinforcement cage andthe shutter offered up to it.

    The Kwikastrip unit is thereforesandwiched in position between theshutter and the main reinforcementcage. The concrete is then pouredand the entire unit is cast into theface of the concrete element/wall(see figure 1).

    Stripping the shutter reveals the lidon the wall face. The lid is removedto reveal the connection legs (seefigure 2), which should be bent outusing the available straightening tool(see figure 3).

    Installation of Kwikastrip

    Anchorage is achieved via thereinforcement delivered projectingout of the casing. Lap is achieved viathe bent out connection legs, whichare spliced to the main reinforcementof the subsequent concrete pour(see figure 4).

    Straightening of bars

    Reinforcement should only bestraightened when the temperatureof the steel is 5C or above. Wherethe temperature of the reinforcementis below 5C, reinforcement may beindirectly warmed to a temperaturenot exceeding 100C but no form ofdirect heat treatment shall be appliedto the reinforcement.

    The available straightening tool (seeopposite) enables the connection legto be straightened correctly andefficiently.

    The use of other implements (e.g.hammers, scaffold tubes) will result inadversely kinked starter bars andunacceptable work hardening of thereinforcement that may adverselyaffect performance of the system.

    The straightening tool is a steel tubewith a specially shaped end and aninternal diameter only slightly greaterthan the diameter of the bar to bestraightened. The tube wall thicknessadequately ensures that the tube willnot flex under load.

    Figure 1 Figure 2

    424.87 Kwikastrip_4:424.68 HDB Studrail 6/5/10 09:39 Page 4

  • 5Halfen reinforcement helpline: 01582 470300 www.halfen.co.uk

    SideEnd

    The length of the tube provides thenecessary leverage to eliminateundesirable jerky movements,otherwise caused as a result of toogreat a physical effort required by theoperative.

    The tube should be placed over thebar and located at the start of thebend. The end of the tube is speciallyshaped (see right) in order tominimise undesirable point contact ofthe tube on the bar and, moreimportantly, to provide continuoussupport to the outside of the bendduring straightening.

    Figure 3 Figure 4

    Typical counter-bending toolThe straightening operation shouldbe smooth and progressive and thetube must be allowed to continuouslyslip around the bend as it becomesstraightened, so in its final restposition, the tube should be incontact with the interface of theembedded case and the bar nowprojecting from it.

    The tube should then be withdrawnand the bar checked for suitablealignment through the joint with dueconsideration to the intendedconcrete cover.

    424.87 Kwikastrip_4:424.68 HDB Studrail 6/5/10 09:39 Page 5

  • Unit type Dimensions Bar type Bar spacings Lap L

    MB12 C150/C200 500

    8.5S

    MB12 C150/C200 500

    15S

    MB12 C150/C200 500

    17S

    MB12 C150/C200 500

    19S

    MB12 C150/C200 500

    22S

    MB12 C150/C200 500

    25S

    MB16 C150/C200 650

    12D

    MB16

    C150 600

    19D C200 650

    MB16 C150/C200 650

    22D

    MB16 C150/C200 650

    25D

    6 Halfen reinforcement helpline: 01582 470300 www.halfen.co.uk

    Kwikastrip range and how to order

    State only the quantity, Kwikastripunit type, bar type and bar centres.

    e.g. 50 no. Kwikastrip M8.5S B12C150 STD

    The engineer should confirm theapplication suitability of alldimensions.

    Kwikastrip is available off the shelf incasing lengths of 1200mm. Thiscasing length is significant becausethe end distances to the first and lastbars (75mm for 150mm centres and100mm for 200mm bar centres)ensures that where the cases arebutted to one another, the correctbar centres are accuratelymaintained, as is the cross sectionalarea of reinforcement throughthe construction joint.

    Bar spacings

    C150

    C200

    Single leg hook bar

    Double leg U bar

    35

    220

    200

    170

    35

    35

    35

    35

    35

    120

    220

    200

    170

    50

    424.87 Kwikastrip_4:424.68 HDB Studrail 6/5/10 09:39 Page 6

  • Care must be takennot to cut projectingbars unless reducedlap length is acceptable

    Cut point

    Remove polystyreneend plug to accommodateprojecting bars

    Re-seal cut endwith polystyreneend plug & tape

    Projecting bars

    Cut point

    Frequently Asked Questions

    Can Kwikastrip be cut on site?Where Kwikastrip needs to be cut tolength, the case material can be cutwith a hand-held cut-off saw.However, extreme care must betaken not to damage the pullout barsinside the case.

    What are the loading differencesbetween Kwikastrip and traditionalloose/unbent rebar?Structural tests (by UK CARES)showed that the flexural and shearstrength of construction joints formedwith Kwikastrip are no less thanthose of traditionally formedconstruction joints.

    If Kwikastrip isnt feasible for myapplication, what can I use instead?In these situations, the Halfen HBMthreaded coupler system forms anideal complement to Kwikastrip.Please ask for details.

    N.B SafetyAll safety regulations and toolmanufacturers instructionsmust be observed whencutting Kwikastrip. Cuttingmay leave sharp edges sosuitable personal protectionequipment must be used.

    We recommend removing one-barsections from one or both ends of aKwikastrip case to reduce the lengthof a unit. If more than one unitoccurs in a run we suggest one-barsections are removed from a numberof units to achieve the requiredreduction in length.

    When a case is shortened theremaining pullout bars will projectfrom the cut ends. These can beoverlapped into an adjacent unit byremoving the polystyrene end seal.Please be sure to reseal the cut endswith polystyrene or a strongformwork tape to prevent the ingressof cement grout.

    7Halfen reinforcement helpline: 01582 470300 www.halfen.co.uk

    424.87 Kwikastrip_4:424.68 HDB Studrail 6/5/10 09:39 Page 7

  • Halfen Limited

    Humphrys Road Woodside Estate Dunstable LU5 4TP

    Tel: +44 (0)1582 470 300 Fax: +44 (0)1582 470 304

    Email: reinforcement@halfen.co.uk Web: www.halfen.co.uk

    Technical approval

    Kwikastrip was the first-ever productto attain Technical Product Approvalby the UK CARES CertificationAuthority for Reinforcing Steels.

    In the UK, due to the absence of anydefinitive British Standard